In 2006, Illinois started early voting before Election Day. Since then, more and more voters are voting early. This dataset includes stats of how many voters cast their ballot early, how many voted by mail, how many military voters voted, etc.

Any Election, there is under voting in which more people vote in one particular race than another. This dataset includes over 30 years of primary elections and shows a countywide race versus a statewide or congressional race and the total number of undervotes.